Personal verification device

Abstract

A device for verifying personal hand markings, e.g., signatures, and optionally, voice-produced sound, by comparison of electronically produced representations thereof with similar stored information wherein such representations are produced by variations of electrical energy caused by hand markings on a surface adapted to receive said markings and comprising a poled sheet of a piezoelectric-forming resin.

I claim: 
     
       1. In a verification device having a surface adapted to receive hand markings and to transmit a representation of said markings by electrical energy for comparison with a similar representation, the improvement wherein said surface comprises a poled sheet of a piezoelectric-forming resin, said poled sheet holding a sufficient charge to provide an electric response when said sheet is hand marked and being coated on each side with an electroconductive coating for transmission of electric responses generated by said hand markings. 
     
     
       2. In the verification device as described in claim 1, said piezoelectric-forming resin being a vinylidene fluoride polymer wherein said polymer is at least 65 mol percent vinylidene fluoride. 
     
     
       3. In the verification device as described in claim 2, said vinylidene fluoride polymer being a homopolymer. 
     
     
       4. In the verification device as described in claim 2, said vinylidene fluoride polymer being a copolymer of at least 65 mol percent vinylidene fluoride with at least one other copolymerizable fluorinated ethylene or propylene monomer. 
     
     
       5. In the verification device as described in claim 2, said poled sheet holding a sufficient charge to provide an electric response from proximate voice-produced sound.